Petrus Olai Dalekarlus (28 February 1601—27 April 1680) was a Swedish academic, Dean and Member of Parliament (riksdagsman).
Petrus Olai Dalekarlus was born on 28 February 1601 in Rättvik, the son of one of the signatories to the decision of the Uppsala meeting, Olaus Petri Hedemorensis.
He traveled to foreign universities around 1638, returning in 1639 to be promoted to masters, and then took office as principal of Västerås School and Associate Professor in Logic.
In 1648, he was appointed a curator in the Stora Skedvi parish, but returned to Västerås, already authorized in 1650, by the Queen to pastors and contractors.
One of the sons was Laurentius Petri Aroselius, and one daughter was married to Samuel Laurentii Höijer.